I found where the issue is. Plutonium nuclear artillery uses a separate ammo category from regular artillery shells to apply research bonuses that regular nukes get. Rampant Arsenal changes the artillery remote to have a specific ammo category it can shoot with, and it's not possible to specify multiple. I suspect it does it to not have the regular remote also trigger the lite artillery.
This means multiple possible solutions:
- Request Factorio devs to change the ArtilleryFlarePrototype to accept multiple shot_category
values
- Revert Plutonium nuke being a separate category and double all damage numbers in it to compensate for no bonuses from "Stronger Explosives" research.
I'm going to go with the second one, it's the fastest to implement. I can also easily revert it later if the ArtilleryFlarePrototype is changed.
Update will be out soon